update CHANGELOG

Author: maxulysse

CHANGELOG.md

@@ -16,6 +16,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 ### Changed
 
 - [#1151](https://github.com/nf-core/sarek/pull/1151) - Refactor codebase
+- [#1157](https://github.com/nf-core/sarek/pull/1157) - Move all vep args from `ext.args` to `params.vep_custom_args` to allow easier modifications
 
 ### Fixed